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	<title>

	content一象素无缺口圆角

	通过使用两个div.sup在div.cnt的上下，各画出1px的无缺口边框
</title>
	<style type="text/css">
	.box .sup{display:block; height:1px; overflow:hidden; margin:0 1px; background:#ccc;}
	.box .sup2{display:block; height:1px; overflow:hidden; border-left:2px solid #ccc; border-right:2px solid #ccc;}
	.box .cnt{border-left:1px solid #ccc; border-right:1px solid #ccc;}
	p {margin:0;padding:0;}
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<body>
	<div class="box">
	<div class="sup"></div>
	<div class="sup2"></div>
	<div class="cnt">
	<p>content一象素无缺口圆角</p>
	<p>通过使用两个div.sup在div.cnt的上下，各画出1px的无缺口边框</p>
	</div>
	<div class="sup2"></div>
	<div class="sup"></div>
	</div>
	

</body>
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